Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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21.11.2024 - 01:28
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30/7-8 R

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  • General information
    General information
    Attribute Value
    Wellbore name
    Official name of wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    30/7-8 R
    Type
    Wellbore type. Legal values: EXPLORATION, DEVELOPMENT, OTHER (see 'Purpose' for more information)
    EXPLORATION
    Purpose
    Final classification of the wellbore.

    Legal values for exploration wellbores:
    WILDCAT, APPRAISAL, WILDCAT-CCS, APPRAISAL-CCS.

    Legal values for development wellbores:
    OBSERVATION, PRODUCTION, INJECTION, INJECTION-CCS, OBSERVATION-CCS.

    Legal values for other wellbores:
    SOIL DRILLING (drilling in connection with track surveys and other subsurface surveys to investigate the soil conditions prior to placement of facilities),
    SHALLOW GAS (drilling to investigate shallow gas before the first 'real' drilling on the location),
    PILOT (drilling to investigate the geology and fluid connectors for location of the main wellbore),
    SCIENTIFIC (drilling according to Law of Scientific research and exploration),
    STRATIGRAPHIC (driling according to Law of Petroleum activities §2-1).
    APPRAISAL
    Status
    Status for the wellbore. Legal values are:

    BLOWOUT: A blowout has occurred in the well.
    CLOSED: A development wellbore that has been closed in a shorter or longer periode. Also applies to development wellbores where drilling is completed, but production/injection has not yet been reported.
    DRILLING: The well is in the drilling phase - can be active drilling, logging, testing or plugging,
    JUNKED: The drilling operation has been terminated due to technical problems.
    P&A: Exploration: The well is plugged and abandoned, and can not be reentered for further use. Development wells: The production/injection from/to the well is stopped and the well is plugged. The wellhead is removed or else made unavailable for further well operations.
    PLUGGED: The wellbore has been plugged, but the upper parts of the wellbore can be re-used. A sidetrack might be drilled at a later stage.
    PRODUCING: It was produced from the wellbore at the time of the operators last monthly report to the Norwegian Offshore Directorate.
    INJECTING: It was injected to the wellbore at the time of the operators last monthly report to the Norwegian Offshore Directorate.
    PREDRILLED: The upper part of the well has been drilled, usually as part of a batch-drilling campaign covering several wellbores.
    RE-CLASS TO DEV: Exploration wellbore that is reclassified to a development wellbore.
    RE-CLASS TO TEST: Exploration wellbore that is reclassified to test production.
    SUSPENDED: The drilling operation in the wellbore has been temporarily stopped. The current plan is to continue drilling later on.
    P&A
    Factmaps in new window
    Main area
    Name of the area on the Norwegian Continental Shelf where the wellbore is located. Legal values: BARENTS SEA, NORWEGIAN SEA, NORTH SEA.
    NORTH SEA
    Field
    Name of the field the wellbore is related to.
    Discovery
    Name of the discovery the wellbore is related to.
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    30/7-8
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    802-61 SP.87.7
    Production licence
    Official designation of the production licence the wellbore was drilled or planned to be drilled from ( well head posistion).
    Drilling operator
    Name of the licensee starting the drilling operation on behalf of the active production license (well head position). This will usually equal the operator of the production license.
    Norsk Hydro Produksjon AS
    Drill permit
    The drilling permit number together with the version of the drilling permit as stated in the drilling permit granted by the Norwegian Offshore Directorate.
    269-L2
    Drilling facility
    Norwegian Offshore Directorate's name of the facility which the wellbore was drilled from.
    Drilling days
    Number of days from wellbore entry to wellbore completion.
    127
    Entered date
    The date when he wellbore was spudded. For sidetracks: The date when new formation was drilled by kicking off from the mother-wellbore,
    23.09.1981
    Completed date
    Exploration wellbores from moveable facilities:
    For floating facilities - date when anchor handling is started. For jackups - date the jacking-down started. Exploration wellbores from fixed facilities and all development wellbores:
    Date when the wellbore is at total depth, and last casing, liner or screen is set. In case of immediate plugging of the wellbore, completed date equals the date the last plug i set in the wellbore.
    Date when the wellbore is at total depth, and last casing, liner or screen is set. In case of immediate plugging of the wellbore, completed date equals the date the last plug i set in the wellbore.
    29.01.1982
    Plugged and abondon date
    Date when the P&A-operations of the wellbore was finished, as reported by the operator to the Norwegian Offshore Directorate throught DDRS (Daily Drilling Reporting System). Only applied once pr. wellhead/surface location.
    29.01.1982
    Release date
    Date when raw data which has been reported to the authorities from the wellbore is not confidential any longer. Normally 2 years after finishing the drilling. May be earlier if the area of the production license is relinquished.
    05.07.2016
    Publication date
    Date quality control of the wellbore information was completed, so it can be published on the internet as a 'Well Data Summary Sheet' wellbore with more information available than other wellbores.
    05.07.2016
    Purpose - planned
    Pre-drill purpose of the wellbore. Legal values for exploration wellbores: WILDCAT, APPRAISAL, WILDCAT-CCS, APPRAISAL-CCS. Example of legal values for development wellbores: OBSERVATION, PRODUCTION, INJECTION.
    WILDCAT
    Reentry
    Status whether the wellbore has been re-entered (YES) or not (NO). Re-entered wellbores are not included in the count when wellbores are presented in statistical overviews.
    YES
    Reentry activity
    Reason for reentry of the wellbore. Only relevant for exploration wellbores. Example of legal values: DRILLING, DRILLING/PLUGGING, LOGGING, PLUGGING, TESTING, TESTING/PLUGGING.
    DRILLING/TESTING/PLUGGING
    Content
    For exploration wellbores, status of discovery.

    Legal values:
    DRY, SHOWS (trace amounts of hydrocarbons), GAS, GAS/CONDENSATE, OIL or OIL/GAS.
    SHOWS (GAS SHOWS, OIL SHOWS or OIL/GAS SHOWS) are detected as fluorescent cut (organic extract), petroleum odour, or visual stain on cuttings or cores, or as increased gas reading on the mud-loggers gas detection equipment.
    Legal values for WILDCAT-CCS and APPRAISAL-CCS: WATER

    For development wellbores, type of produced/injected fluid.
    Legal values:
    WATER, CUTTINGS, NOT AVAILABLE, OIL, GAS/CONDENSATE, OIL/GAS, CO2, GAS, WATER/GAS, NOT APPLICABLE.
    GAS/CONDENSATE
    Discovery wellbore
    Indicator which tells if the wellbore made a new discovery. Legal values: YES, NO. Prior to press-release or other information regarding drilling results, the indicator will be “NO” as a default.
    NO
    1st level with HC, age
    Age of lithostratigraphic unit, 1st level, where hydrocarbons were encountered. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EOCENE. See also Norwegian Offshore Directorate bulletins.
    MIDDLE JURASSIC
    1st level with HC, formation
    Name of lithostartigraphic unit, 1st level, where hydrocarbons were encountered. Shown only for released wells. Examples of legal values: BASEMENT, COOK FM, EKOFISK FM, HEIMDAL FM, SANDNES FM, SOGNEFJORD FM, TARBERT FM, BRENT GP. See also Norwegian Offshore Directorate bulletins.
    TARBERT FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    25.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    103.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    4813.0
    Final vertical depth (TVD) [m RKB]
    Vertical elevation from total depth to kelly bushing. Shown only for released wells. Referred to as true vertical depth (TVD).
    4812.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    10.75
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    160
    Oldest penetrated age
    Age (according to Geologic Time Scale 2004 by F. M. Gradstein, et al. (2004)) of the oldest penetrated formation. May differ from age at TD for example in deviated wellbores. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EARLY PERMIAN, EARLY TRIASSIC, EOCENE.
    LATE TRIASSIC
    Oldest penetrated formation
    Name of the oldest lithostratigraphic unit penetrated by the wellbore. Shown only for released wells. In most wellbores this is formation or group at total depth. May differ from formation or group at TD for example in wellbores drilled with high deviation or through faults. Examples of legal values: AMUNDSEN FM, BALDER FM, BASEMENT, BLODØKS FM, BRYNE FM, BURTON FM, COOK FM, DRAKE FM, DRAUPNE FM, EKOFISK FM, DUNLIN GP.
    HEGRE GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    60° 29' 43.08'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 0' 20.56'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6707144.14
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    445370.62
    UTM zone
    Universal Transverse Mercator zone. Examples of legal values: 31, 32, 33, 34.
    31
    NPDID wellbore
    Norwegian Offshore Directorate's unique id for the wellbore.
    506

  • Wellbore history
    General
    Well 30/7-8 R is a re-entry of well 30/7-8, which was suspended with TD at 4287 m due to technical problems, without fulfilling the well objectives. The well was drilled on the Norwegian part of the Shetland Basin in the northern North Sea. The objectives were to test the hydrocarbon potential in the Middle Jurassic Brent Group (primary objective), and the Early Jurassic Cook Formation and Statfjord Group (secondary objectives).
    Operations and results
    Appraisal well 30/7-8 was re-entered with the semi-submersible installation Treasure Seeker on 23 November 1980. It was kicked off at 3755 m and drilled to final TD at 4813 m in the Late Triassic Hegre Group. No significant problem was encountered in the operations. The well was drilled with Spersene/XP-20/Resinex/Drispac water based mud from kick-off to TD.
    The primary target reservoir, Tarbert Formation came in at 4058 m. It contained gas condensate with a gas/water contact at 4112 +/- 5 m, based on pressure gradients. Shows were described on cuttings and cores over the interval 4489.3 to 4555 m in the Statfjord Group, Nansen Formation.
    Ten cores were cut in the well. Cores 1 - 8 were cut from 4062.3 m to 4159.3 m in the primary target Tarbert Formation sandstones, while cores nine and ten were cut in the intervals 4489.3 to 4502.5 m and 4527.1 to 4540.6 m, both in the Statfjord Group. The core depths are 4-5 m deeper than the logger depths. RFT fluid samples from 4105 m recovered gas, condensate, water and mud filtrate.
    The well was permanently abandoned on 29 January 1982 as a gas/condensate discovery.
    Testing
    One drill stem test was performed from perforations in the interval 4064 to 4070 m. The test produced 478 Sm3 condensate and 617590 Sm3 gas /day through a 32/64" choke. The separator GOR was 1291 Sm3/Sm3, the condensate gravity was 41.3 °API, and the gas gravity was 0.679 (air = 1). The gas contained 2.3% CO2. The bottom hole temperature measured in the test was 143 °C.

  • Cores at the Norwegian Offshore Directorate
    Cores at the Norwegian Offshore Directorate
    Core sample number
    Core sample - top depth
    Core sample - bottom depth
    Core sample depth - uom
    1
    4062.3
    4075.8
    [m ]
    2
    4075.8
    4083.0
    [m ]
    3
    4083.0
    4093.8
    [m ]
    4
    4093.8
    4105.8
    [m ]
    5
    4105.8
    4123.9
    [m ]
    6
    4123.9
    4133.0
    [m ]
    7
    4133.0
    4148.7
    [m ]
    8
    4148.7
    4155.5
    [m ]
    9
    4489.6
    4501.8
    [m ]
    10
    4527.1
    4540.5
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    105.4
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 4489-4494m
    Core photo at depth: 4494-4498m
    Core photo at depth: 4498-4501m
    Core photo at depth: 4527-4531m
    Core photo at depth: 4531-4536m
    4489-4494m
    4494-4498m
    4498-4501m
    4527-4531m
    4531-4536m
    Core photo at depth: 4536-4540m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    4536-4540m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    4062.3
    [m]
    C
    IKU
    4062.4
    [m]
    C
    RRI
    4067.8
    [m]
    C
    IKU
    4068.3
    [m]
    C
    RRI
    4070.5
    [m]
    C
    IKU
    4074.0
    [m]
    C
    IKU
    4077.3
    [m]
    C
    RRI
    4082.0
    [m]
    C
    RRI
    4083.0
    [m]
    C
    IKU
    4083.4
    [m]
    C
    RRI
    4089.8
    [m]
    C
    RRI
    4102.2
    [m]
    C
    RRI
    4105.8
    [m]
    C
    RRI
    4107.0
    [m]
    C
    RRI
    4107.7
    [m]
    C
    IKU
    4108.4
    [m]
    C
    RRI
    4115.0
    [m]
    C
    RRI
    4118.7
    [m]
    C
    IKU
    4123.9
    [m]
    C
    IKU
    4130.8
    [m]
    C
    RRI
    4132.8
    [m]
    C
    IKU
    4136.5
    [m]
    C
    IKU
    4155.5
    [m]
    C
    IKU
    4170.0
    [m]
    SWC
    IKU
    4178.0
    [m]
    SWC
    IKU
    4207.0
    [m]
    SWC
    IKU
    4217.0
    [m]
    SWC
    IKU
    4230.0
    [m]
    SWC
    IKU
    4241.0
    [m]
    SWC
    IKU
    4249.5
    [m]
    SWC
    IKU
    4260.0
    [m]
    SWC
    IKU
    4271.5
    [m]
    SWC
    IKU
    4325.0
    [m]
    SWC
    IKU
    4345.0
    [m]
    DC
    IKU
    4375.0
    [m]
    SWC
    IKU
    4375.0
    [m]
    DC
    IKU
    4383.9
    [m]
    SWC
    IKU
    4385.0
    [m]
    SWC
    IKU
    4398.0
    [m]
    SWC
    IKU
    4405.0
    [m]
    DC
    IKU
    4417.0
    [m]
    SWC
    IKU
    4429.5
    [m]
    SWC
    IKU
    4455.0
    [m]
    DC
    IKU
    4465.0
    [m]
    SWC
    IKU
    4470.0
    [m]
    SWC
    IKU
    4475.0
    [m]
    SWC
    IKU
    4478.0
    [m]
    DC
    IKU
    4540.0
    [m]
    DC
    IKU
    4570.0
    [m]
    DC
    IKU
    4582.0
    [m]
    SWC
    IKU
    4590.0
    [m]
    DC
    IKU
    4600.0
    [m]
    SWC
    IKU
    4605.0
    [m]
    DC
    IKU
    4615.0
    [m]
    DC
    IKU
    4625.0
    [m]
    DC
    IKU
    4631.0
    [m]
    SWC
    IKU
    4640.0
    [m]
    SWC
    IKU
    4645.0
    [m]
    DC
    IKU
    4658.0
    [m]
    SWC
    IKU
    4665.0
    [m]
    DC
    IKU
    4680.0
    [m]
    SWC
    IKU
    4685.0
    [m]
    DC
    IKU
    4692.0
    [m]
    SWC
    IKU
    4705.0
    [m]
    DC
    IKU
    4712.0
    [m]
    SWC
    IKU
    4725.0
    [m]
    DC
    IKU
    4745.0
    [m]
    DC
    IKU
    4751.0
    [m]
    SWC
    IKU
    4755.0
    [m]
    SWC
    IKU
    4765.0
    [m]
    DC
    IKU
    4773.0
    [m]
    SWC
    IKU

  • Lithostratigraphy

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.64
    pdf
    0.64

  • Documents – reported by the production licence (period for duty of secrecy expired)
    Documents – reported by the production licence (period for duty of secrecy expired)
    Document name
    Document format
    Document size [MB]
    pdf
    3.26
    pdf
    28.57

  • Drill stem tests (DST)
    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    4064
    4070
    12.7
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    143
    Drill stem tests (DST)
    Test number
    Oil
    [Sm3/day]
    Gas
    [Sm3/day]
    Oil density
    [g/cm3]
    Gas grav. rel.air
    GOR
    [m3/m3]
    1.0
    445
    617590
    0.810
    0.680
    1291

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL
    3626
    4379
    CST
    3730
    4808
    CYBERDIP
    3721
    4811
    DLL MSFL
    4050
    4728
    HDT
    3721
    4811
    ISF SON
    3721
    4811
    ISF SON LDT CNL
    3721
    4391
    ISF SON MSFL
    4378
    4811
    LDT CNL
    3721
    4811
    NGT
    4000
    4370
    RFT
    4059
    4284
    RFT
    4062
    4105
    RFT
    4487
    4719
    VSP
    780
    4800

  • Casing and leak–off tests
    Casing and leak–off tests
    Casing type
    Casing diam.
    [inch]
    Casing depth
    [m]
    Hole diam.
    [inch]
    Hole depth
    [m]
    LOT/FIT mud eqv.
    [g/cm3]
    Formation test type
    CONDUCTOR
    30
    215.0
    36
    215.0
    0.00
    LOT
    SURF.COND.
    20
    926.0
    26
    1011.0
    1.52
    LOT
    INTERM.
    13 3/8
    2633.0
    17 1/2
    2648.0
    1.83
    LOT
    INTERM.
    9 5/8
    3726.0
    12 1/4
    3741.0
    2.08
    LOT
    LINER
    7
    4379.0
    8 3/8
    4394.0
    2.24
    LOT
    OPEN HOLE
    4812.0
    6
    4812.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    300
    1.04
    53.0
    Waterbased
    800
    1.03
    27.0
    Waterbased
    970
    1.04
    27.0
    Waterbased
    1260
    1.10
    47.0
    Waterbased
    1700
    1.30
    46.0
    Waterbased
    1830
    1.26
    47.0
    Waterbased
    2650
    1.56
    48.0
    Waterbased
    3010
    1.63
    50.0
    Waterbased
    3390
    1.69
    50.0
    Waterbased
    3750
    1.96
    85.0
    Waterbased
    4000
    1.99
    55.0
    Waterbased
    4200
    2.03
    51.0
    Waterbased
    4400
    2.04
    54.0
    Waterbased
    4812
    2.04
    59.0
    Waterbased

  • Thin sections at the Norwegian Offshore Directorate
    Thin sections at the Norwegian Offshore Directorate
    Depth
    Unit
    4532.43
    [m ]
    4527.76
    [m ]